Conveying means for articles to be treated in a galvanizing bath



2 Sheets-Sheet 1 Fig.1 Ewen-501 cI M I. WILSON Dec. 8, 1953 CONVEYINGMEANS FOR ARTICLES TO BE TREATED IN A GALVANIZING BATH Filed March 30,1951 Dec. 8, 1953 E. MCI. WILSON 5 I7 CONVEYING MEANS FOR ARTICLES TO BETREATED IN A GALVANIZING BATH Filed March 50, 1951 2 Sheets-Sheet 2Fig.2 122/0 612E601 Paten tec l Dec. 8,

' oiivtmi sit/muss Fomsnoms' Tons 'TREKTED'I A V N ZING BATHj ElIWMdMcIvor. JWilson, Birmingham, England; *assignm: 120 Heiniy rHope '&-'Sons Limited,--z-Bjre mineham-Z-E-ngland appetite Marine), 1951,Serial No.'-218;5'04 i J warms. (01. 118-500.)

In the galvanising of steel window or door amsspsg r rt le ii: -l fime..fiP vide above the galvanising bath, a mechanism for loweringandiir'a'i'sing theJarticl'es into and from bj ect of the presentinvention is. to enable 1th saa meenamsmto impart a -shaki ngforsjqg- 5actionj -t'o"the"aftieles,"for .ensuring, uniorm mg ofthe" articleswhen; fiflirriersed and jdeta'enmm of excess" cliatingmetal" whilethearticles are being withdrawn from the bath.

The invention comprises the combination with the raising and loweringmechanism, of a spring arranged at a position between the source ofmotion and the part which carries the articles to be treated, and meansfor intermittently compressing the spring and thereby imparting ajogging motion to the articles.

In particular the invention comprises an arrangement as specified in thepreceding paragraph, which includes pneumatic means for compressing thespring, and intermittently actuated valve for controlling the supply ofcompressed air to and from the said means.

In the accompanying drawings:

Figure 1 is a diagrammatic view illustrating a galvanising apparatusprovided with the invention.

Figure 2 is a front elevation to a larger scale that Figure 1 showingthe means in accordance with the invention for interconnecting themovable part of the conveyor track and the raising and loweringmechanism.

A known form of apparatus for use in galvanising steel window or doorframes'or other articles, comprises (as shown in Figure 1), an overheadconveyor track a on which can travel a carriage from which the articlesare suspended. In the portion of the track above the galvanising bath bthere is provided a movable part c which can be lowered for effectingthe dipping operation. This part c is guided by guide rods d and issuspended by a suspension rod e. The upper end of the rod e is pivotallyattached to one side of an endless chain I carried by sprockets 9, oneof which is driven from any convenient source of motion for lowering andraising the track part c.

In applying the invention to an apparatus as above described, there issecured to the upper side of the track part c a frame It provided with across bar 2. The-cross bar supports one end of a piston rod 9' extendingfrom a piston in an air cylinder 70. The latter is connected through ashackle m'to a rod 0 which is slidably supported by the upper end of theframe h. On the rod 0 is mounted a spring 1) which is supported at onein a simple and reliable manner.

eridiiy tnerrain ad,. atsears eta-b "a 1:011- larsecur d to. eib'd rodo' is 'securedlto ajblockiq tmwhich .is

attalchdthe loiter lendgo'f aflijrik r, .andlimslid a ble assticiationwith .thi link]. i'sfprovided-La. rod. :3 which 1 at its upper. fen "isjsecu eefby a block; tito "fro "aj th rons Qnnected "by? ifspr ingj. u. I,iisjnierl fiogensur'e l'ose' fitting 6f thep-ait 6 6f thetrafiHWh'eflit 'is returned to the main part a of the track.

Compressed air is admitted to and exhaustedfrom the lower end of thecylinder is by a flexible pipe 12 (Figure 1), under the control of avalve w which is actuated at an appropriate rate by any convenient meanssuch as an electromagnet which is self controlled by any convenientelectrical or other timing means (not shown). If desired air may also beadmitted to and exhausted from the upper end of the cylinder k by way ofa second pipe 0 under the control of the valve 20.

After the movable part c of the track and the carriage thereon, togetherwith the articles to be galvanised, having been lowered (as shown inFigure 1) to immerse the articles in the bath, air is admitted to thelower end of the cylinder it. As the cylinder cannot move, the effect ofthe air pressure is to move the piston upwardly, and (by the resultantforce exerted through the piston rod 9' on the bar 2'), to move theframe h (together with the track part c) upwardly against the action ofthe spring p. On release of the air pressure, the spring p returns theparts to their initial position suddenly, thus imparting a jolt to thearticles suspended from the track part c. If desired air may also beadmitted to the upper end of the cylinder k to supplement the action ofthe spring p, though this is not essential. The jogging or joltingaction is repeated to ensure uniform coating of the articles. Also it iscontinued during the withdrawal of the articles from the bath, to ensuredetachment of excess zinc which might otherwise form solid drops on thearticles.

By this invention the desired object is attained The invention is not,however, restricted to the example described, as the means foralternately compressing and releasing the spring 11 may be varied,though a pneumatic mechanism is preferable on account of its simplicityand convenience.

Having thus described my invention what I claim as newand desire tosecure by Letters Patent is:

1. Conveying means for articles to be treated in a galvanising bath,comprising in combination a mechanism for loweringand raising thearticles into and from the bath, carrying means for the articles, saidcarrying means being movably attached to said mechanism forreciprocatory motion relatively thereto, a pair of springsupportingabutments provided on said mechanism and carrying means respectively, aspring arranged between and supported at its ends by said abutments sothat said spring is energisable by vertical movements of said carryingmeans in one direction relatively to said mechanism, and power-operatedmeans connected to said mechanism and arranged to act on said carryingmeans for co-operating with said spring to effect intermittent verticalreciprocatory motion of said carrying means relatively to saidmechanism, and thereby impart a jogging motion to articles on saidcarrying means.

2. Conveying means as claimed in claim 1, in which the power operatedmeans comprise a piston and cylinder mounted respectively on saidmechanism and carrying means, and relatively movable under the action ofcompressed air.

3. Conveying means for articles to be treated in a galvanising bath;comprising in combina- 25 tion a mechanism for raising and lowering thearticles into and from the bath, carrying means for the articlesincluding a vertically movable track part provided at its upper sidewith a frame carrying means.

which has a slidable connection with said mechanism to permitreciprocatory motion of said carrying means relatively to saidmechanism, an air cylinder attached to said mechanism, a piston in saidcylinder, a piston rod extending from said piston and connected to saidframe, a pair or spring-supporting abutments on said mechanism and framerespectively, a compression spring arranged between and supported at itsends by said abutments so that said spring is compressible by upwardmovement of said carrying means relatively to said mechanism, and meansfor controlling the flow to and from said cylinder of compressed airwhereby said piston is caused to cooperate with said spring foreffecting intermittent vertical reciprocatory motion of said carryingmeans relatively to said mechanism, and thereby imparting a joggingmotion to articles on said EDWARD McIVOR WILSON.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,027,402 Cleal May 28, 1912 1,092,761 Tyler Apr. '7, 19141,608,293 Beebe Nov. 23, 1926 2,397,400 Barwich Mar. 26, 1946 m mm-

